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41.
Tropospheric pollutants including surface ozone(O_3), nitrogen dioxide(NO_2), carbon monoxide(CO) and meteorological parameters were measured at a traffic junction(78°2′ E and 27°11′ N) in Agra, India from January 2012 to December 2012. Temporal analysis of pollutants suggests that annual average mixing ratios of tropospheric pollutants were: O_3— 22.97 ± 23.36 ppbV,NO_2— 19.84 ± 16.71 ppb V and CO — 0.91 ± 0.86 ppm V, with seasonal variations of O_3 having maximum mixing ratio during summer season(32.41 ± 19.31 ppbV), whereas lowest was found in post-monsoon season(8.74 ± 3.8 ppbV). O_3 precursors: NO_2 and CO, showed inverse relationship with O_3. Seasonal variation and high O_3 episodes during summer are associated with meteorological parameters such as high solar radiation, atmospheric temperature and transboundary transport. The interdependence of these variables showed a link between the daytime mixing ratios of O_3 with the nighttime level of NO_2. The mixing ratios of CO and NO_2 showed tight correlations, which confirms the influence of vehicular emissions combined with other anthropogenic activities due to office/working hours, shallowing, and widening of boundary layer. FLEXTRA backward trajectories for the O_3 episode days clearly indicate the transport from the NW and W to S/SE and SW direction at Agra in different seasons. 相似文献
42.
Malladi Srinivas Reddy Ramakrishna Saini Sudheer Kumar Dontamalla B. Suhasini 《毒物与环境化学》2015,97(7):839-846
A three-component one-pot protocol has been investigated for the synthesis of imidazo[4,5-f]indol-7-yl)indolin-2-ones from the commercially available materials. Structures of these compounds were established on the basis of IR, 1H NMR, and mass spectral data. The title compounds were evaluated for their antimicrobial activity. Two compounds exhibited the potent antimicrobial activity. 相似文献